This is the only "coroner's" book I've ever seen on Co. Monaghan. It's a very unusual book that shows a lot of hard work on the part of the author.
I saw your other messages about McCabes of Currin parish and Clerkins of Aghabog parish, Co. Monaghan. The coroner's casebook has several entries for McCabes and Clarkins, and one entry for Clerkin. Hugh Clerkin of Cooldaragh, Drumsnat parish, died in 1858, and Margaret Clarkin of Drumbrain, Aghabog parish, died in 1869. Mary Ann McCabe of Corrinshigoe, Currin parish, died in 1866. Patrick McCabe of Clones died in 1869. There are others in various parishes.
Obviously your ancestors were Catholic and more records on them may be in local parish church registers. Have you searched those, and looked up all you could on Clerkins and McCabes in civil registrations of births, marriages, deaths?
More Irish records are on-line daily at the LDS FamilySearch site and you might find something there. Write me directly and I'll be glad to help further if I can.